Muffle



No. 752,438. PATENTED FEB. 16, 1904.

V J. & A. G. CARTER..

MUFFLB.

APPLIDATION FILED JULY 2B, 1903. N0 MQDEL. 2 SHETS-BHBET 1.

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PATENTED FEB. 16, .1904.' J. '& A. G. CARTER.

` MUPFLE.

APPLIOATION FILED JULY 2e, 190s.

2 SHEETS-SHEET 2.

No MODEL.

ATTORNEYS UNITED STATES Patented February 16, 1904.

PATENT OFFICE.

JOHN CARTER AND ALFRED GEORGE CARTER, OF MALDEN,

lvLASSACHUSETTS.

VMUFFLE.

SPECIFICATION forming part of Letters Patent No. 752,438, dated February16, 1904.

' Application filed July 28, 1903.` Serial No. 167,291. (No model.)

To @ZZ whom it may concern:

Be it known that we, JOHN CARTER and AL- FRED GEORGE CARTER, citizens ofthe United States, and residents of Malden, in the county of Middlesexand State of Massachusetts, have invented a new and Improved Muffle, ofwhich the following is a full, clear, and exact description.

Our invention relates to muiiies, and more particularly to a type ofmufie in which combustion is very thorough and the heat evenlydistributed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in both figures.

Figure 1 is a vertical central section on the line'l 1 in Fig. 2vthrough a muflie embodying our invention, and Fig. 2 is a section uponthe line 2 2 in Fig., 1.

A base 1 is provided with an annular portion 2, surrounded by acylindrical portion-3, and upon this cylindrical portion is a conicalstack 4.. Fire-holes are shown at 5, each being provided with grate-bars6 and with a door 7 having a threshold 8, supported upon a lintel y 9.Above the grate-bars 6 are apertures 10, from which .the smoke and gasesof combustion are free to pass upward through passages 11 to the chamber12. A central iiue 13 is provided, and encircling this central line is arelatively large cylinder 14, surmounted by a dome 14, this dome beingconnected with the central flue 13. The lower end of the central flue 13is connected with a head 13, below which are radially-disposed passages15, each of which is connected with a vertical passage 16. Each4vertical passage is obstructed at its upper portion by an arch 17. Adome 18 is supported by the arches 17, which obstruct the passages 16,and by apertured arches 17 a, which register with the passages 11. Bymeans of passages 19 the vertical passages 16 are free to discharge thegases of combustion into the conical stack 4. A plate 20*L in the natureof a damper projects slightly from the junction between the cylinder 3and the stack 4, said plate being slidably movable back and forth overthe passages 19, as desired. A comparatively short alternative Vflue 21is mounted upon the dome 18, and a 5o Y cap 22provided witha ring 23, ispivoted at 24 upon the alternative iiue 21 and is free to move upwardly,as indicated. by dotted lines in Fig. 1, a chain 25B" being connectedwith the ring 23 and passing over a pulley 26 toahandle 27, whereby the.cap may be opened when starting the lires, and when the fires haveattained suiiicient headway the cap may be closed. A passage 28 isprovided in the cylindrical portion 3 for the purpose of inspecting thecondition or the iames within the passages 11,v and it will be notedthat the passages 11 and 16 alternate with each other.

The meile-chamber is shown at 25. Passages 29 in the annular portion 2are bifurcated into distinct branches 15EL 15b, (see Fig. 2,) and thesebranchesterminate in apertures 15c (see Fig. 1) for the purpose ofdischarging air into the flame, such air being heated in its passagefrom passages 29'to the apertures 152 7o and does not in any measurecool the tires, but mixing with the gases adds to the intensity of thesame.

Our invention is used as follows: Fires being lighted in the severalfire-holes 5 by means of fuel resting upon the grate-bars 6, the smokeand gases of combustion pass upwardly through all of the passages 11,thence through the passages 12, and downward through the central line13, as indicated by the arrows in 8o Fig. 1. The smoke and gasesarriving at the bottom of the central flue 13 radiate outwardly and passupwardly through the passages 16 until they encounter thedeflecting-arches 17, from whence they pass upwardly' through thepassages 19 20 into the conical stack or chimney 4, thus making theirescape. It will be noted that the severalupward drafts represented bythe passages 11 are arranged alternately with the several upward draftsrepresented by the passages 16. The air is drawn inward through theseveral radially-disposed passages 29 and is thence divided anddistributed through the branches 15 15b and apertures 15e to the flamesat points elevated somewhat above the grate-bars 6. By this means thedevice acts somewhat in the capacity of a smoke-consumer, therebycausingthorough combustion ofthe unburned gases and smoke and not onlyeconomizing fuel, but causing a more perfect distribution of the heat.

Having thus described our invention, we

claim as new and desire to secure by Letters Patent- 1. In a muiiie, thecombination of a hollow member, a cylinder mounted therein and connectedthereto, a central flue connected with said cylinder and passing throughthe same, a dome covering said cylinder and said flue, said dome beingprovided with an aperture, a mem member, a revoluble pulley mountedtherein, a central flue disposed within said hollow member, a cylinderencircling said iiue, a dome covering said cylinder and said centrallue, said dome being provided with an aperture, a closure member forclosing said aperture, anda chain connected with said kclosure memberand passing over said pulley for the purpose of enabling said closuremember to be operated from a point external to the Inutile.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

' JOHN CARTER.

ALFRED GEORGE CARTER.

Witnesses:

RALPH S. CARTER, ERNEST CARTER.

